They are both good options. The general way I break it down is:

Is this your first Linux PC? Bazzite

Is this a home theater PC or other console like device? Bazzite

Do you have a lot of specialized hardware that needs custom drivers / kernel modules? CachyOS

Do you want to be able to more easily customize parts of the os? CachyOS

Obviously not every case is covered here but hopefully that gives you a bit more of an idea of what each distro is better at. Performance wise they are nearly identical, tbh the biggest difference is that Bazzite is an atomic distro and CachyOS isn't.